Try these games:

Mancala Snails (against computer or a peer): http://www.contactmusic.com/new/games.nsf/webpages/snails
Connect Four (against a peer): http://www.berghuis.co.nz/abiator/games/connect-4.html
Lemonade Stand:http://www.classbrain.com/cb_games/cb_gms_bag/lemonade.html
No Line of Sight Cannon Game: http://dsc.discovery.com/tv/future-weapons/games/cannon/cannon.html
Battleship (against computer): http://www.learn4good.com/games/board/battleship.htm
Addition Ring Toss: http://highlightskidsplus.com/Magazine/sept05/h1magazineFlashObjects/h10905septemberArtist.asp
Game of Morris (against computer or a peer): http://www.osv.org/kids_zone/morris/
Fox and Geese (against computer or a peer): http://www.osv.org/kids_zone/foxgeese/
Action Fraction: http://funschool.kaboose.com/fun-blaster/back-to-school/games/game_action_fraction.html
Integer Eaters: http://hoodamath.com/games/integereater.php
Hooda Math Games: http://hoodamath.com/games/index.php
Coordinate Graphing (Dig a Dino): http://www.counton.org/games/flash/virtualmathfest/dinosaur.swf
Order of Operations: http://www.funbrain.com/cgi-bin/alg.cgi?A1=s&A2=3
Tony's Pizza Shop: http://www.mrnussbaum.com/pizza_game/index.html
Bridge Crossing: http://www.coolmath-games.com/Logic-bridgecrossing/index.html
Totem Destroyer: http://hoodamath.com/games/totemdestroyer.php
How much money can you make? -- http://www.elfontheshelf.com/#/kitchen
Quest for Money! ---http://www.scholastic.com/mint/questformoney/
probability games -
http://www.scholastic.com/teachers/activity/probability-5-studyjams-interactive-math-activities
http://mrnussbaum.com/probfair/
http://jmathpage.com/JIMSProbabilitypage.html


"Whack a Mole"- coordinate graphing http://funbasedlearning.com/algebra/graphing/points/